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Don’t fall prey to a Twitter bot. Smile.

Everyone has a friend who won’t oblige when asked politely to “Say cheese” for a group photo. A new Twitter bot soon might allow you a chance at revenge, by turning that frown upside down into a creepy, toothy grin.

Currently, you can see it in action on celebrities @smilevector, an algorithm created by New Zealand neural network researcher Tom White.

If you submit a photo of your favorite celebrity in a glum or neutral pose, it’ll turn it into a bizarre, “I just ate a child” kind of grin. The bot “uses a generative neural network to add or remove smiles from images it finds in the wild” or submitted to its follow list, according to its creator.